1668888388499 has 2 divisors, whose sum is σ = 1668888388500. Its totient is φ = 1668888388498.

The previous prime is 1668888388493. The next prime is 1668888388513. The reversal of 1668888388499 is 9948838888661.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1668888388499 - 2⁴ = 1668888388483 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1668888388499.

It is not a weakly prime, because it can be changed into another prime (1668888388493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 834444194249 + 834444194250.

It is an arithmetic number, because the mean of its divisors is an integer number (834444194250).

Almost surely, 2^{1668888388499} is an apocalyptic number.

1668888388499 is a deficient number, since it is larger than the sum of its proper divisors (1).

1668888388499 is an equidigital number, since it uses as much as digits as its factorization.

1668888388499 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9172942848, while the sum is 86.

The spelling of 1668888388499 in words is "one trillion, six hundred sixty-eight billion, eight hundred eighty-eight million, three hundred eighty-eight thousand, four hundred ninety-nine".